土壤电阻率与饱和度定量关系的确定  

The quantitative relationship of soil resistivity and saturation degree

作　　者：聂艳侠 胡黎明[1,2] 温庆博[1,2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]清华大学水利水电工程系,北京100084

出　　处：《岩石力学与工程学报》2016年第A01期3441-3448,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2012CB719804)~~

摘　　要：目前,高密度电阻率成像法已广泛应用于环境岩土工程实践,特别是渗流及污染物运移监测。同时,实时、三维、无损的高密度电阻率成像法成功实现土工物理模型试验中渗流过程的实时观测,而定量分析则需要建立土壤电阻率与饱和度的定量关系模型,将高密度电阻率量测得到的电阻率数据换算成土中饱和度变化数据,以分析土中水的运移行为。结合Archie模型,开展标定试验确定土壤电阻率与饱和度的定量关系式,并通过水分运移的室内1 g模型试验验证定量关系式的有效性和适用性。结果表明利用土壤电阻率与饱和度定量公式换算得到的饱和度实时数据与实测数据对应良好,土壤电阻率与饱和度定量公式的精度满足要求。在既得电阻率与饱和度定量公式的基础上,可应用高密度电阻率成像法实现土中渗流过程的实时量测和定量分析,深入研究渗流机制。At present, high-density electrical resistivity tomography（HERT） has been widely used in environmental geotechnical engineering, especially seepage and solute transport. High-density electrical resistivity tomography provides a new method to satisfy the necessities of three-dimensional, non-destructive, and real-time measurement. In order to carry out soil seepage migration process of observation and quantitative analysis, a quantitative relationship model of soil resistivity and saturation needs to be established. The calibration tests are carried out to determine the quantitative relationship between the soil resistivity and saturation of the soil combined Archie model, and the 1 g model tests are used to verify the quantitative formula＇s validity and applicability. The results show that the real-time saturation data obtained by the quantitative formula of soil resistivity and saturation correspond well with the measured data. The accuracy of the quantitative formula of soil resistivity and saturation meets the requirement. Based on the quantitative formula of soil resistivity and saturation, high-density electrical resistivity tomography can be applied to achieve real-time measurement and quantitative analysis of seepage mechanism in soil.

关 键 词：土力学 高密度电阻率法 土壤电阻率 饱和度 定量分析 水分运移 

分 类 号：TU41[建筑科学—岩土工程]